DTC Troubleshooting

DTC Troubleshooting: P0103

DTC P0103: MAF Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II), and wait 2 seconds.

2. Check the MAF SENSOR in the DATA LIST with the HDS.

Is about 202 gm/s, or 4.89 V or more indicated?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM.


3. Turn the ignition switch to LOCK (0).

4. Jump the SCS line with the HDS.

5. Disconnect the MAF sensor/IAT sensor 5P connector.

6. Disconnect ECM connector B (44P).

7. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and ECM connector terminal B32.

Is there continuity?
YES - Go to step 8.

NO - Repair open in the wire between the ECM (B32) and the MAF sensor/IAT sensor, then go to step 15.






8. Reconnect ECM connector B (44P).

9. Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire.






10. Turn the ignition switch to ON (II).

11. Clear the DTC with the HDS.

12. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Go to step 20.

NO - Go to step 13.


13. Turn the ignition switch to LOCK (0).

14. Replace the MAF sensor/IAT sensor. Service and Repair

15. Reconnect all connectors.

16. Turn the ignition switch to ON (II).

17. Reset the ECM with the HDS.

18. Do the ECM idle learn procedure. ECM Idle Learn Procedure

19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


20. Turn the ignition switch to LOCK (0).

21. Reconnect all connectors.

22. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

23. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.